Credit Facility (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Credit Facility
Amount drew down	$ 100,000	$ 100,000	$ 3,500	$ 15,000
Principal payments of Term Loan
2021		778
2022		778
2023		388
Total		1,944
Amortization of debt issuance costs
2021		457
2022		457
2023		120
Total		1,034
Credit Facility
Principal payments of Term Loan
Capitalized interest expense		1,146	98	288
Amortization and interest expense recorded		$ 678	399	$ 106
Credit Facility | Minimum
Principal payments of Term Loan
Interest rate percentage		3.00%
Credit Facility | Maximum
Principal payments of Term Loan
Interest rate percentage		4.00%
Credit Facility | LIBOR | Minimum
Credit Facility
Spread on floating interest rate (as a percent)		1.75%
Credit Facility | LIBOR | Maximum
Credit Facility
Spread on floating interest rate (as a percent)		2.75%
Credit Facility | Prime Rate | Minimum
Credit Facility
Spread on floating interest rate (as a percent)		0.75%
Credit Facility | Prime Rate | Maximum
Credit Facility
Spread on floating interest rate (as a percent)		1.75%
Revolving Line of Credit
Credit Facility
Current issued borrowing capacity		$ 150,000
Amount outstanding		$ 0	0
Revolving Line of Credit | Minimum
Credit Facility
Fee on unused portion of Revolving Line of Credit (as a percent)		0.25%
Revolving Line of Credit | Maximum
Credit Facility
Fee on unused portion of Revolving Line of Credit (as a percent)		0.50%
Term Loan
Credit Facility
Current issued borrowing capacity		$ 3,500
Amount outstanding		$ 1,944	$ 2,722