Stockholders' Equity - Other (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) installment $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	May 25, 2021 shares
Stockholders' Equity
Shares available for issuance	3,000,000.0
Number of shares
Outstanding at the beginning of the period (in shares)		592,000
Granted (in shares)		163,000
Vested (in shares)		(256,000)
Outstanding at the end of the period (in shares)			592,000
Weighted-average grant date fair value
Outstanding at the beginning of the period (in dollars per share) | $ / shares		$ 12.32
Granted (in dollars per share) | $ / shares		9.59
Vested (in dollars per share) | $ / shares		$ 12.65
Outstanding at the end of the period (in dollars per share) | $ / shares			$ 12.32
Stock option and restricted stock
Stock-based compensation
Stock-based compensation expense (in dollars) | $	$ 6,100	$ 5,300
Restricted Stock
Stock-based compensation
Unrecognized compensation cost related to unvested restricted stock (in dollars) | $	$ 4,400
Weighted-average periods over which unrecognized compensation cost recognized	1 year 8 months 12 days
Number of shares
Outstanding at the beginning of the period (in shares)	499,000
Granted (in shares)	647,000
Vested (in shares)	(529,000)
Forfeited (in shares)	(3,000)
Outstanding at the end of the period (in shares)	614,000	499,000
Weighted-average grant date fair value
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 11.26
Granted (in dollars per share) | $ / shares	11.79
Vested (in dollars per share) | $ / shares	11.25
Forfeited (in dollars per share) | $ / shares	12.56
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 11.79	$ 11.26
Employee Stock Options
Stock-based compensation
Unrecognized compensation cost related to unvested stock options (in dollars) | $	$ 3,200
Weighted-average periods over which unrecognized compensation cost recognized	2 years 6 months
Estimated forfeitures (as a percent)	1.50%
Valuation assumptions
Dividend yield (as a percent)	0.00%
Number of shares
Outstanding at the beginning of the period (in shares)	3,935,000	3,855,000
Granted (in shares)	625,000	80,000
Exercised (in shares)	(50,000)
Forfeited (in shares)	(8,000)
Expired (in shares)	(57,000)
Outstanding at the end of the period (in shares)	4,445,000	3,935,000	3,855,000
Vested at the end of the period (in shares)	3,415,000
Exercisable at the end of the period (in shares)	3,415,000
Weighted-average exercise price
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 11.69	$ 11.72
Granted (in dollars per share) | $ / shares	11.94	10.05
Exercised (in dollars per share) | $ / shares	10.20
Forfeited (in dollars per share) | $ / shares	14.00
Expired (in dollars per share) | $ / shares	14.55
Outstanding at the end of the period (in dollars per share) | $ / shares	11.69	$ 11.69	$ 11.72
Vested at the end of the period (in dollars per share) | $ / shares	11.65
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 11.65
Weighted-average remaining contractual term
Outstanding	4 years 9 months 18 days	5 years 1 month 6 days	6 years 1 month 6 days
Granted	6 years	6 years
Vested at the end of the period	3 years 8 months 12 days
Exercisable at the end of the period	3 years 8 months 12 days
Aggregate intrinsic value
Outstanding at the beginning of the period (in dollars) | $	$ 291	$ 12,101
Outstanding at the end of the period (in dollars) | $		$ 291	$ 12,101
Weighted-average grant date fair value of options granted (in dollars per share) | $ / shares	$ 4.70	$ 4.01
Performance-based Stock Option
Number of shares
Unvested options	500,000
Performance-based Restricted Stock
Number of shares
Unvested options	42,500
Aggregate intrinsic value
Vesting period	3 years
Time Based Restricted Stock and Stock Option
Stockholders' Equity
Number of equal annual installments for vesting of awards | installment	3
Time Based Restricted Stock and Stock Option | Black Scholes Pricing Model
Valuation assumptions
Weighted-average expected term (years)		6 years
Time Based Restricted Stock and Stock Option | Minimum | Black Scholes Pricing Model
Valuation assumptions
Risk-free interest rate (as a percent)	0.94%	0.42%
Volatility (as a percent)	37.30%	44.20%
Time Based Restricted Stock and Stock Option | Maximum | Black Scholes Pricing Model
Valuation assumptions
Risk-free interest rate (as a percent)	1.29%	0.50%
Volatility (as a percent)	40.70%	46.10%
Time Based Restricted Stock
Aggregate intrinsic value
Vesting period	3 years
Common Class A
Stockholders' Equity
Shares authorized for issuance				10,200,000