Stock-based Compensation - Stock Option Activity (Details) - Stock Option $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares
Number of Options
Outstanding at beginning of period (shares) | shares		2,847,101
Options granted (shares) | shares	0	5,000
Options exercised (shares) | shares		(501,136)
Options forfeited (shares) | shares		(41,135)
Outstanding at end of period (shares) | shares	2,309,830	2,309,830
Weighted-Average Exercise Price Per Share
Outstanding at beginning of period (USD per share) | $ / shares		$ 13.22
Options granted (USD per share) | $ / shares		29.03
Options exercised (USD per share) | $ / shares		2.70
Options forfeited (USD per share) | $ / shares		23.73
Outstanding at end of period (USD per share) | $ / shares	$ 15.35	$ 15.35
Aggregate Intrinsic Value
Intrinsic value of options exercised | $		$ 15,864
Intrinsic value of options outstanding | $	$ 45,896	$ 45,896