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Statement of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Total
Balance at Dec. 31, 2014 $ 314 $ 302,969   $ (243,993) $ 59,290
Balance (in shares) at Dec. 31, 2014 31,434,272        
Increase (Decrease) in Stockholders' Equity          
Sale of common stock, net of issuance cost $ 86 115,118     115,204
Sale of common stock, net of issuance cost (in shares) 8,625,000        
Issuance of common stock upon exercise and vesting of stock awards $ 4 550     554
Issuance of common stock upon exercise and vesting of stock awards (in shares) 379,268        
Issuance of common stock under the Employee Stock Purchase Plan $ 1 622     623
Issuance of common stock under the Employee Stock Purchase Plan (in shares) 112,499        
Comprehensive income (loss)     $ (516) (17,592) (18,108)
Stock-based compensation expense   4,869     4,869
Balance at Dec. 31, 2015 $ 405 424,128 (516) (261,585) 162,432
Balance (in shares) at Dec. 31, 2015 40,551,039        
Increase (Decrease) in Stockholders' Equity          
Sale of common stock, net of issuance cost $ 53 119,216     119,269
Sale of common stock, net of issuance cost (in shares) 5,272,750        
Issuance of common stock upon exercise and vesting of stock awards $ 7 1,153     1,160
Issuance of common stock upon exercise and vesting of stock awards (in shares) 699,066        
Issuance of common stock under the Employee Stock Purchase Plan $ 1 544     545
Issuance of common stock under the Employee Stock Purchase Plan (in shares) 45,123        
Comprehensive income (loss)     (925) 23,625 22,700
Stock-based compensation expense   7,848     7,848
Balance (Scenario, Previously Reported) at Dec. 31, 2016 $ 466 552,889 (1,441) (237,960) 313,954
Balance at Dec. 31, 2016 $ 466 553,290 (1,441) (238,361) 313,954
Balance (in shares) (Scenario, Previously Reported) at Dec. 31, 2016 46,567,978        
Balance (in shares) at Dec. 31, 2016 46,567,978        
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock upon exercise and vesting of stock awards $ 4 2,793     2,797
Issuance of common stock upon exercise and vesting of stock awards (in shares) 363,603        
Issuance of common stock under the Employee Stock Purchase Plan   936     936
Issuance of common stock under the Employee Stock Purchase Plan (in shares) 70,907        
Comprehensive income (loss)     (367) (48,925) (49,292)
Stock-based compensation expense   13,651     13,651
Balance at Dec. 31, 2017 $ 470 570,670 $ (1,808) (287,286) $ 282,046
Balance (in shares) at Dec. 31, 2017 47,002,488        
Increase (Decrease) in Stockholders' Equity          
Adoption of ASU 2016-09 | ASU 2016-09   $ 401   $ (401)