Debt - Additional Information (Details)		1 Months Ended						3 Months Ended		9 Months Ended
	Jun. 14, 2017 USD ($)	Aug. 31, 2019 USD ($)	Jul. 31, 2019	May 31, 2019 USD ($)	Apr. 30, 2019	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2020 USD ($) $ / shares		Jun. 30, 2019 USD ($)	Aug. 31, 2017 USD ($)	Apr. 30, 2014	Feb. 28, 2013
Debt
Common stock value										$ 91,000		$ 89,000
Principal amount of the Notes										204,816,000		176,296,000
Debt discount costs										11,069,000		12,534,000
Minimum
Debt
Fixed Charge Coverage Ratio								50.00%	75.00%
Revolving Credit Facility
Debt
Principal amount of the Notes										30,723,000	[1]	28,265,000
Initial borrowing capacity	$ 52,000,000.0
Minimum drawn balance (as a percent)	30.00%
Outstanding revolving credit facility										$ 30,700,000
90-day LIBOR | Revolving Credit Facility
Debt
Interest rate determination basis										90-day LIBOR
Variable rate (as a percent)	4.50%			3.50%	4.50%
Repurchase
Debt
Repurchase/Retirement of existing notes													$ 28,000,000.0
Revolving Credit Agreement | Revolving Credit Facility
Debt
Reduced borrowing capacity							$ 32,000,000.0
Term Loan Facility due December 2022
Debt
Principal amount of the Notes										$ 89,093,000		63,031,000
Debt discount costs										$ 3,646,000		$ 2,951,000
Term Loan Facility due December 2022 | Term loan
Debt
Initial term loan borrowing capacity							40,000,000.0
Additional term loan borrowing capacity							$ 20,000,000.0
Loan prepayment fees for first year (percentage)							3.00%
Loan prepayment fees for second year (percentage)							2.00%
Loan prepayment fees for third year (percentage)							1.00%
Term of loan (in months)							60 months
Term of interest payable (in months)							24 months
Administrative fee payable on term loan as a percentage							0.25%
Final payment of administrative fee payable on term loan as a percentage							4.00%
Debt instrument amount withdrawn						$ 5,000,000.0
Debt instrument scheduled commitment extended termination date						Jun. 30, 2019
Debt instrument remaining unfunded commitment amount						$ 15,000,000.0
Term Loan Facility due December 2022 | 90-day LIBOR | Term loan
Debt
Interest rate determination basis										90-day LIBOR
Variable rate (as a percent)							6.75%
Term Loan Facility Due May 2024 | Term loan
Debt
Debt instrument increased commitment amount		$ 25,000,000		$ 500,000
Debt discount costs		$ 1,600,000		$ 1,500,000
Term Loan Facility Due May 2024 | 90-day LIBOR | Term loan
Debt
Interest rate determination basis										90-day LIBOR
Variable rate (as a percent)		6.75%	5.50%	5.50%	6.75%
3.50% Convertible Notes
Debt
Interest rate (as a percent)															3.50%
3.50% Series A Convertible Senior Notes
Debt
Interest rate (as a percent)														3.50%
3.75% Convertible Senior Notes due 2022
Debt
Interest rate (as a percent)										3.75%		3.75%	3.75%
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)										174.8252
Principal amount used for debt instrument conversion ratio										$ 1,000
Conversion price (in dollars per share) | $ / shares										$ 5.72
Aggregate principal amount of debt issued													$ 85,000,000.0
Repurchase price, as a percentage of the principal amount, in the event of a fundamental change, as defined in Indenture										100.00%
Principal amount of the Notes										$ 85,000,000		$ 85,000,000
Debt discount costs										$ 7,423,000		$ 9,583,000
3.75% Convertible Senior Notes due 2022 | Exchange
Debt
Aggregate principal amount of debt issued													53,000,000.0
3.75% Convertible Senior Notes due 2022 | Repurchase
Debt
Aggregate principal amount of debt issued													32,000,000.0
3.50% Convertible Notes due 2018 and 3.5% Series A Senior Notes due February 2018 | Exchange
Debt
Aggregate principal amount of debt issued													$ 47,000,000.0

[1] Unamortized debt costs of $1.0 million recorded in other assets on the consolidated balance sheet.