v3.20.2
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 60 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Cash flows from operating activities:              
Net loss $ (8,930) $ (15,925) $ (12,731) $ (13,674) $ (31,461) $ (38,817)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Non-cash royalty revenue related to royalty monetization         (181) (238)  
Non-cash interest income on liability related to royalty monetization (825)   (986)   (2,502) (375) $ 29,033
Depreciation and amortization         1,471 1,153  
Non-cash interest expense related to debt financing         823 471  
Stock-based compensation         3,340 3,779  
Other         463 292  
Changes in operating assets and liabilities:              
Accounts receivable         (696) (195)  
Inventories         734 (2,981)  
Prepaid expenses and other assets         616 (709)  
Accounts payable         174 843  
Accrued liabilities         (1,238) 465  
Operating lease liabilities         (673) (477)  
Deferred revenue         (3,048) (236)  
Net cash used in operating activities         (32,178) (37,025)  
Cash flows from investing activities:              
Purchase of property and equipment         (224) (3,228)  
Purchase of investments         (38,817) (81,924)  
Proceeds from maturities of investments         67,405 41,700  
Net cash provided by (used in) investing activities         28,364 (43,452)  
Cash flows from financing activities:              
Proceeds from issuance of long-term debt         0 25,000  
Payment of costs in connection with refinancing of long-term debt         0 (190)  
Payment of long-term debt         (2,583) (3,470)  
Extinguishment of debt         0 (8,864)  
Net proceeds from issuance of common stock in connection with equity financings         11,400 1,233  
Net proceeds from issuance of common stock through equity plans         372 742  
Payment of employee tax obligations related to vesting of restricted stock units         (86) 0  
Net cash provided by financing activities         9,103 14,451  
Net increase (decrease) in cash and cash equivalents         5,289 (66,026)  
Cash and cash equivalents—Beginning of period   $ 14,684   $ 87,975 14,684 87,975  
Cash and cash equivalents—End of period $ 19,973   $ 21,949   $ 19,973 $ 21,949 $ 19,973