Long-Term Debt, Net - Additional Information (Details) - USD ($)		3 Months Ended
	May 09, 2019	Dec. 31, 2019	Dec. 31, 2018	Oct. 30, 2017
Debt Instrument [Line Items]
Debt extinguishment costs	$ 152,000
Debt issuance costs		$ 0
Amortization of deferred debt issuance costs		100,000	$ 233,000
Term loans to bank under the Senior Secured Credit Facility | Secured Debt
Debt Instrument [Line Items]
Original principal amount				$ 40,000,000
Senior Secured Credit Facility | Line of Credit
Debt Instrument [Line Items]
Revolving line of credit borrowing capacity				$ 110,000,000
Quarterly principal payment		$ 1,250,000
Senior Secured Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Unused commitment fee (percent)		0.15%
Senior Secured Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Unused commitment fee (percent)		0.30%
Senior Secured Credit Facility | Line of Credit | Prime Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		0.50%
Senior Secured Credit Facility | Line of Credit | Prime Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		2.00%
Senior Secured Credit Facility | Line of Credit | 30-day LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		2.75%
Senior Secured Credit Facility | Line of Credit | 30-day LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		4.00%
2019 Senior Secured Credit Facility | Line of Credit
Debt Instrument [Line Items]
Revolving line of credit borrowing capacity	300,000,000
Optional addition to borrowing capacity	50,000,000
Unused commitment fee (percent)		0.30%
Remaining borrowing capacity		$ 165,963,000
Debt covenant, equity repurchase limit from employees, directors, officers or consultants	$ 3,000,000
Debt covenant, dividend or distribution limit as percent of net cash proceeds from additional common equity issuance (percent)	5.00%
2019 Senior Secured Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Unused commitment fee (percent)	0.15%
2019 Senior Secured Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Unused commitment fee (percent)	0.30%
2019 Senior Secured Credit Facility | Line of Credit | One, Two, Three or Six-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		3.25%
2019 Senior Secured Credit Facility | Line of Credit | One, Two, Three or Six-month LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.25%
2019 Senior Secured Credit Facility | Line of Credit | One, Two, Three or Six-month LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	3.25%
2019 Senior Secured Credit Facility | Line of Credit | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.50%
2019 Senior Secured Credit Facility | Line of Credit | LIBOR plus 1%
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.00%	1.25%
2019 Senior Secured Credit Facility | Line of Credit | LIBOR plus 1% | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.25%
2019 Senior Secured Credit Facility | Line of Credit | LIBOR plus 1% | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.25%
2019 Senior Secured Credit Facility | Line of Credit | Letter of Credit | Maximum
Debt Instrument [Line Items]
Unused commitment fee (percent)	3.25%