Stockholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Total Restricted Stock Units
Non-vested at beginning of period (in shares)	11,301
Vested (in shares)	(9,060)
Non-vested at end of period (in shares)	2,241
Weighted-Average Grant Date Fair Value Per Share
Nonvested, weighted average grant date fair value at end of period (in USD per share)	$ 15.38
Vested, weighted average grant date fair value (in USD per share)	10.89
Nonvested, weighted average grant date fair value at end of period (in USD per share)	$ 33.49
Equity instruments other than options, aggregate intrinsic value, nonvested	$ 11,227		$ 14,013
Equity instruments other than options, aggregate intrinsic value, vested	13,763
Equity instruments other than options, vested in period, fair value	$ 98,703	$ 147,516