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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Total
Beginning balance at Dec. 31, 2019 $ 44 $ 606,307   $ (325,331) $ 281,020
Beginning balance (in shares) at Dec. 31, 2019 43,996,753        
Increase (Decrease) in Stockholders' Equity          
Stock compensation expense   5,475     5,475
Issuance of common stock in connection with ESPP   324     324
Issuance of common stock in connection with ESPP (in shares) 18,673        
Issuance of common stock in connection with exercise of stock options   383     383
Issuance of common stock in connection with exercise of stock options (in shares) 72,964        
Unrealized gain (loss) on marketable securities     $ 63   63
Net income (loss)       (34,164) (34,164)
Ending balance at Mar. 31, 2020 $ 44 612,489 63 (359,495) 253,101
Ending balance (in shares) at Mar. 31, 2020 44,088,390        
Beginning balance at Dec. 31, 2020 $ 44 625,762 49 (459,327) 166,528
Beginning balance (in shares) at Dec. 31, 2020 44,235,903        
Increase (Decrease) in Stockholders' Equity          
Stock compensation expense   5,191     5,191
Issuance of common stock in connection with ESPP   388     388
Issuance of common stock in connection with ESPP (in shares) 17,000        
Issuance of common stock in connection with exercise of stock options and vesting of restricted stock units   3,466     3,466
Issuance of common stock in connection with exercise of stock options and vesting of restricted stock units (in shares) 198,855        
Issuance of common stock upon completion of public offering, net of offering costs $ 6 161,725     161,731
Issuance of common stock upon completion of public offering, net of offering costs (in shares) 5,750,000        
Change in unrealized gain (loss) on marketable securities     (107)   (107)
Net income (loss)       43,750 43,750
Ending balance at Mar. 31, 2021 $ 50 $ 796,532 $ (58) $ (415,577) $ 380,947
Ending balance (in shares) at Mar. 31, 2021 50,201,758