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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2019 $ 57,052 $ 144 $ 906,905 $ 114 $ (850,111)
Balance (in shares) at Dec. 31, 2019   144,291      
Issuance of common stock from public offerings, net of offering costs 67,112 $ 18 67,094    
Issuance of common stock from public offerings, net of offering costs (in shares)   17,867      
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases 1,193 $ 2 1,191    
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases (in shares)   1,803      
Stock-based compensation 3,754   3,754    
Other comprehensive loss (237)     (237)  
Net loss (16,466)       (16,466)
Balance at Mar. 31, 2020 112,408 $ 164 978,944 (123) (866,577)
Balance (in shares) at Mar. 31, 2020   163,961      
Balance at Dec. 31, 2020 103,806 $ 168 1,012,932 674 (909,968)
Balance (in shares) at Dec. 31, 2020   168,170      
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases 1,171   1,171    
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases (in shares)   2,621      
Stock-based compensation 5,333   5,333    
Other comprehensive loss (218)     (218)  
Net loss (17,457)       (17,457)
Balance at Mar. 31, 2021 $ 92,635 $ 168 $ 1,019,436 $ 456 $ (927,425)
Balance (in shares) at Mar. 31, 2021   170,791