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Equity - Changes in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance at beginning of period $ 86,350 $ 91,585 $ 90,823 $ 104,080 $ 91,585 $ 104,080
Exercise of common stock options 58 246 1,532 2,373    
Exercise of common stock options, shares         26,911  
Issuance for employee stock purchase plan   444   510    
Issuance for employee stock purchase plan, shares         32,826  
Shares withheld for employee taxes upon vesting of RSUs (35) (488) (140) (216)    
Stock-based compensation expense 4,162 4,263 3,526 2,728    
Net loss (4,712) (9,700) (13,060) (18,652) $ (14,412) (31,712)
Balance at end of period 85,823 86,350 82,681 90,823 85,823 82,681
Common Stock            
Balance at beginning of period $ 33 $ 33 $ 33 $ 33 $ 33 $ 33
Balance at beginning of year, shares 33,385,128 33,265,629 33,027,579 32,770,678 33,265,629 32,770,678
Exercise of common stock options, shares 8,218 18,693 137,419 183,987    
Issuance for employee stock purchase plan, shares   32,826   50,151    
Vesting of restricted stock units, shares 26,304 101,483 20,887 32,573    
Shares withheld for employee taxes upon vesting of RSUs, shares (3,097) (33,503) (6,205) (9,810)    
Balance at end of period $ 33 $ 33 $ 33 $ 33 $ 33 $ 33
Balance at end of year, shares 33,416,553 33,385,128 33,179,680 33,027,579 33,416,553 33,179,680
Additional Paid-In Capital            
Balance at beginning of period $ 433,194 $ 428,729 $ 407,491 $ 402,096 $ 428,729 $ 402,096
Exercise of common stock options 58 246 1,532 2,373    
Issuance for employee stock purchase plan   444   510    
Shares withheld for employee taxes upon vesting of RSUs (35) (488) (140) (216)    
Stock-based compensation expense 4,162 4,263 3,526 2,728    
Balance at end of period 437,379 433,194 412,409 407,491 437,379 412,409
Accumulated Deficit            
Balance at beginning of period (346,877) (337,177) (316,701) (298,049) (337,177) (298,049)
Net loss (4,712) (9,700) (13,060) (18,652)    
Balance at end of period $ (351,589) $ (346,877) $ (329,761) $ (316,701) $ (351,589) $ (329,761)