Cash, Cash Equivalents and Available for Sale Securities - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ 191,563	$ 117,203
Balance at end of period	167,188	104,630
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	3	0
Current period changes in fair value before reclassifications, net of tax	(1)	0
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Total other comprehensive income	(1)	0
Balance at end of period	$ 2	$ 0