Stockholders' Equity and Stock-Based Compensation - Summary of Restricted Stock Award and Restricted Stock Unit Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Restricted Stock Awards
Number of restricted shares
Balance, beginning (in shares) | shares	115
Granted (in shares) | shares	403
Vested (in shares) | shares	(11)
Forfeited & modified (in shares) | shares	(48)
Balance, ending (in shares) | shares	459
Weighted average exercise price
Balance, beginning (in dollars per share) | $ / shares	$ 37.15
Granted (in dollars per share) | $ / shares	18.17
Vested (in dollars per share) | $ / shares	37.15
Forfeited & modified (in dollars per share) | $ / shares	37.15
Balance, ending (in dollars per share) | $ / shares	$ 20.49
Restricted Stock Units
Number of restricted shares
Balance, beginning (in shares) | shares	557
Granted (in shares) | shares	2,107
Vested (in shares) | shares	(117)
Forfeited & modified (in shares) | shares	(140)
Balance, ending (in shares) | shares	2,407
Weighted average exercise price
Balance, beginning (in dollars per share) | $ / shares	$ 30.31
Granted (in dollars per share) | $ / shares	17.86
Vested (in dollars per share) | $ / shares	26.94
Forfeited & modified (in dollars per share) | $ / shares	32.19
Balance, ending (in dollars per share) | $ / shares	$ 19.47