| Component: (Network and Table) | |
|---|---|
| Network | 00500 - Statement - Consolidated Statements of Cash Flows (http://www.catabasis.com/role/StatementConsolidatedStatementsOfCashFlows)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0001454789 (http://www.sec.gov/CIK) | 
| Consolidated Statements of Cash Flows | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31  | 2015-01-01 - 2015-12-31  | 2014-01-01 - 2014-12-31  | |
Consolidated Statements of Cash Flows  | |||
Operating activities  | |||
Net loss  | (36,060,000)   | (32,630,000)   | (21,884,000)   | 
Reconciliation of net loss to net cash used in operating activities:  | |||
Depreciation and amortization  | |||
Stock-based compensation expense  | |||
Accretion of discount/premium on investment securities  | |||
Non-cash interest expense  | |||
Gain on the sale of fixed assets  | (  | ||
Changes in assets and liabilities:  | |||
Prepaid expenses and other current assets  | (  | (  | (  | 
Other assets  | |||
Accounts payable  | |||
Accrued expenses  | |||
Deferred rent  | (  | (  | |
Net cash used in operating activities  | (  | (  | (  | 
Investing activities  | |||
Purchases of available-for-sale securities  | (  | (  | |
Sales and maturities of available-for-sale securities  | |||
Purchases of property and equipment  | (  | (  | (  | 
Sale of property and equipment  | |||
Net cash used in investing activities  | (  | (  | (  | 
Financing activities  | |||
Proceeds from initial public offering, net of issuance costs  | |||
Proceeds from issuance of preferred stock, net of issuance costs  | |||
Proceeds from registered direct offering, net of issuance costs  | |||
Proceeds from at-the-market offering, net of issuance costs  | |||
Proceeds from exercise of common stock options and warrants  | |||
Proceeds from borrowing  | |||
Payments on borrowing  | (  | (  | |
Debt issuance costs  | (  | (  | |
Net cash provided by financing activities  | |||
Net (decrease) increase in cash and cash equivalents  | (  | (  | |
Cash and cash equivalents, beginning of period  | 62,780,000    | ||
Cash and cash equivalents, end of period  | 23,596,000    | 62,780,000    | 14,668,000    | 
Supplemental disclosure of cash flow information  | |||
Cash paid for interest  | |||
Non-cash financing activities  | |||
Warrants for the purchase of series B preferred stock issued in conjunction with credit facility  | |||
Initial public offering costs in accounts payable and accrued liabilities  | (  | ||
Reclassification of deferred IPO costs from non-current assets to additional paid-in capital  | |||
Reclassification of warrant liability to additional paid-in capital  | |||