Stock Based Compensation - Share Based Compensation Activity (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Options Outstanding
Beginning balance (in shares) | shares	410
Granted (in shares) | shares	587
Exercised (in shares) | shares	(6)
Forfeited and cancelled (in shares) | shares	(63)
Ending balance (in shares) | shares	928
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 14.50
Granted (in dollars per share) | $ / shares	12.64
Exercised (in dollars per share) | $ / shares	10.16
Forfeited and cancelled (in dollars per share) | $ / shares	7.49
Ending balance (in dollars per share) | $ / shares	$ 13.83
Restricted Stock Awards
Restricted Stock and RSU Awards Outstanding
Beginning balance (in shares) | shares	171
Granted (in shares) | shares	21
Vested (in shares) | shares	(122)
Forfeited and cancelled (in shares) | shares	(40)
Beginning balance (in shares) | shares	30
Weighted Average Award Value
Beginning balance (in dollars per share) | $ / shares	$ 23.53
Granted (in dollars per share) | $ / shares	29.19
Vested (in dollars per share) | $ / shares	25.82
Forfeited and canceled (in dollars per share) | $ / shares	15.35
Ending balance (in dollars per share) | $ / shares	$ 29.30
RSU Awards
Restricted Stock and RSU Awards Outstanding
Beginning balance (in shares) | shares	0
Granted (in shares) | shares	360
Vested (in shares) | shares	0
Forfeited and cancelled (in shares) | shares	0
Beginning balance (in shares) | shares	360
Weighted Average Award Value
Beginning balance (in dollars per share) | $ / shares	$ 0
Granted (in dollars per share) | $ / shares	12.64
Vested (in dollars per share) | $ / shares	0
Forfeited and canceled (in dollars per share) | $ / shares	0
Ending balance (in dollars per share) | $ / shares	$ 12.64