Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Unvested Shares of Restricted Stock Units (Details)

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Stock-Based Compensation - Summary of Unvested Shares of Restricted Stock Units (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Unvested Restricted Stock Units      
Unvested restricted stock units, beginning of the period(in shares) 434,119 640,632 282,780
Granted (in shares) 101,181 103,556 460,185
Vested (in shares) (231,896) (270,069) (97,890)
Forfeited (in shares) (82,163) (40,000) (4,443)
Unvested restricted stock units, ending of the period (in shares) 221,241 434,119 640,632
Weighted Average Grant-Date Fair Value      
Unvested restricted stock units, beginning of the period (in USD per share) $ 22.78 $ 19.44 $ 14.98
Granted (in USD per share) 6.83 27.74 20.72
Vested (in USD per share) 22.45 19.26 15.07
Forfeited (in USD per share) 18.55 20.68 15.00
Unvested restricted stock units, ending of the period (in USD per share) $ 22.43 $ 22.78 $ 19.44