Stock Based Compensation - Schedule of activity with respect to non-vested stock options (Details) - Non vested equity awards shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares (in thousands)
Balance at January 1, 2019 (in shares) | shares	193
Granted (in shares) | shares	225
Vested (in shares) | shares	(13)
Forfeited and canceled (in shares) | shares	(53)
Balance at December 31, 2019 (in shares) | shares	352
Weighted Average grant- date fair value
Balance at January 1, 2019 (in dollars per share) | $ / shares	$ 9.88
Granted (in dollars per share) | $ / shares	24.77
Vested (in dollars per share) | $ / shares	13.32
Forfeited and canceled (in dollars per share) | $ / shares	24.18
Balance at December 31, 2019 (in dollars per share) | $ / shares	$ 23.08