Debt (Details)										1 Months Ended													2 Months Ended	3 Months Ended			6 Months Ended	12 Months Ended
		Oct. 20, 2020 USD ($)	Oct. 16, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 12, 2020 USD ($)	Aug. 09, 2019 USD ($)	Nov. 01, 2018 USD ($) $ / shares	Jul. 26, 2018 USD ($)	Nov. 07, 2017 USD ($)	Mar. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2020 USD ($) shares	Oct. 31, 2020 USD ($) shares	Aug. 31, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	Aug. 31, 2019 USD ($) $ / shares	Aug. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Aug. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jun. 30, 2014 USD ($) $ / shares	Jul. 31, 2013 USD ($) $ / shares	Nov. 30, 2020 USD ($) shares	Mar. 31, 2021 USD ($) $ / shares	Mar. 31, 2020 USD ($)	Jun. 30, 2017 USD ($) shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Feb. 09, 2021 $ / shares	Feb. 05, 2021 USD ($)	Aug. 09, 2020 $ / shares	Jul. 09, 2020 $ / shares	Feb. 09, 2020 $ / shares	Aug. 01, 2018 USD ($)	Mar. 31, 2017 USD ($)
Debt (Details) [Line Items]
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares											177,085	708,340		177,085	710,100								354,170
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares										$ 0.001	$ 0.001													$ 0.001								$ 0.001
Debt Conversion, Converted Instrument, Amount											$ 1,000,000.0	$ 4,000,000.0		$ 1,000,000.0	$ 7,100,000								$ 2,000,000.0
Paid-in-Kind Interest											36,528	138,248		27,288	200,000								63,225	$ 925,000	$ 1,155,000
Stock Issued During Period, Value, Conversion of Convertible Securities											1,400,000	$ 5,400,000		$ 1,300,000	$ 9,500,000								$ 2,600,000	5,631,000
Liabilities, Fair Value Adjustment																								(9,047,000)	7,675,000
Amortization of Debt Discount (Premium)																								$ 719,000	$ 693,000
3.25% Convertible Senior Notes Due 2023 [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										3.25%									3.25%					3.25%
Value of debt outstanding										$ 37,700,000	$ 34,100,000													$ 37,700,000
Debt Instrument, Face Amount								$ 8,000,000.0
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares																$ 1.00													$ 5.647		$ 5.647	$ 10.00	$ 1.00
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares										531,255	177,085	708,340	354,170	177,085	710,100
Debt Instrument, Redemption Price, Percentage																105.00%
Interest rate if paid cash																			3.25%
Interest rate if paid stock																			5.00%
Interest rate if paid in-kind																			2.75%
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger																30.00%
Debt Instrument, Convertible, Threshold Percentage of Market Price Trigger																150.00%
Equity Method Investment, Ownership Percentage																49.00%
Debt Conversion, Converted Instrument, Amount										$ 3,000,000.0	$ 1,000,000.0	$ 4,000,000.0	$ 2,000,000.0	$ 1,000,000.0	$ 7,100,000
Paid-in-Kind Interest										128,230	36,528	138,248	63,225	27,288	200,000
Stock Issued During Period, Value, Conversion of Convertible Securities															$ 9,500,000
Adjustments to Additional Paid in Capital, Other										$ 5,600,000	1,400,000	$ 5,400,000	$ 2,600,000	$ 1,300,000
4.25% Convertible Senior Notes (due 2018) [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																			4.25%			4.25%
Debt Instrument, Face Amount								$ 8,000,000.0											$ 21,600,000			$ 100,000,000.0
Debt Instrument, Convertible, Conversion Ratio																						114.3674
Debt Instrument, Convertible, Incremental Value of Principal Converted																						$ 1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares																						$ 8.74
Debt Instrument, Repurchase Amount																										$ 12,000,000.0	$ 12,000,000.0	$ 6,100,000							$ 39,100,000
Write off of Deferred Debt Issuance Cost																										100,000		$ 100,000
Repayments of Convertible Debt																											$ 24,100,000
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares																											290,000
Gain (Loss) on Extinguishment of Debt																										100,000
Interest rate if paid cash								3.25%
Interest rate if paid stock								5.00%
Interest rate if paid in-kind								2.75%
Debt Conversion, Converted Instrument, Amount																		$ 8,000,000.0
3.25% Convertible Senior Notes (due 2020) [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								3.25%											3.25%
Debt Instrument, Face Amount								$ 8,000,000.0
Debt Instrument, Convertible, Conversion Ratio								322.2688
Debt Instrument, Redemption Price, Percentage							105.00%
4.875% Convertible Senior Notes Due 2020 [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										4.875%											4.875%			4.875%
Value of debt outstanding																$ 111,100,000
Debt Instrument, Face Amount																113,000,000.0					$ 115,000,000.0
Debt Instrument, Convertible, Conversion Ratio																					103.7613
Debt Instrument, Convertible, Incremental Value of Principal Converted																					$ 1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares																					$ 9.64
Debt Instrument, Repurchase Amount																				$ 2,000,000.0
Write off of Deferred Debt Issuance Cost						$ 700,000														100,000
Gain (Loss) on Extinguishment of Debt						(2,400,000)														$ 100,000
Debt Instrument, Original Amount Of Debt Refinanced																103,800,000
Debt Instrument, Amount Of Accrued Interest Refinanced																1,000,000.0
Debt Instrument, Amount Of Debt Exchanged Into A New Instrument																$ 7,300,000
Convertible Debt, Fair Value Disclosures											1,800,000
Benefit Street Partners [Member]
Debt (Details) [Line Items]
Debt Instrument, Face Amount																														$ 11,000,000.0
Paycheck Protection Program Loan [Member] | Unsecured Debt [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					1.00%
Debt Instrument, Face Amount					$ 6,200,000
Monthly payments					$ 261,275
Long-term Debt, Current Maturities										1,700,000														1,700,000
Long-term Debt, Excluding Current Maturities										4,500,000														4,500,000
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member]
Debt (Details) [Line Items]
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares																$ 0.001
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] | 3.25% Convertible Senior Notes Due 2023 [Member]
Debt (Details) [Line Items]
Debt Instrument, Face Amount																$ 8,000,000.0			$ 21,600,000
Debt Instrument, Principal Amount, Redeemed																																		$ 13,200,000
Paid-in-Kind Interest																								7,700,000
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] | 3.25% Convertible Senior Notes (due 2020) [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																			3.25%
Debt Instrument, Face Amount																			$ 21,600,000
Debt Instrument, Convertible, Conversion Ratio							393.7008												328.0302
Debt Instrument, Convertible, Incremental Value of Principal Converted							$ 1,000										$ 1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares							$ 2.54
Gain (Loss) on Extinguishment of Debt								$ (500,000)	$ (600,000)							$ (10,400,000)
Liabilities, Fair Value Adjustment																								9,000,000.0
Common Stock [Member] | 4.25% Convertible Senior Notes (due 2018) [Member]
Debt (Details) [Line Items]
Debt Instrument, Repurchase Amount																										$ 11,600,000	$ 11,600,000
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares																										11,240
Secured Debt [Member] | New Term Loan Agreement [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																10.50%
Value of debt outstanding	[1]									119,801,000	119,801,000													119,801,000
Interest Payable										5,500,000	4,700,000													5,500,000
Interest rate if paid cash																8.00%
Interest rate if paid in-kind																2.50%
Paid-in-Kind Interest		$ 300,000
Line of Credit Facility, Maximum Borrowing Capacity																$ 134,800,000
Debt Instrument, Covenant Compliance, EBITDA Requirment			$ 25,000,000.0	$ 34,000,000.0
Debt Instrument, Covenant Compliance, Minimum Liquidity				$ 10,000,000.0
Debt, Pre-payment			15,000,000.0
Repayments of Debt		$ 15,000,000.0
Notes Payable										125,300,000	124,500,000													125,300,000
Notes Payable, Current										5,000,000.0	5,000,000.0													5,000,000.0
Notes Payable, Noncurrent										114,800,000	114,800,000													114,800,000
Debt Issuance Costs, Gross										3,800,000														3,800,000
Amortization of Debt Issuance Costs																								300,000
Debt Instrument, Unamortized Discount						$ 10,100,000
Amortization of Debt Discount (Premium)																								700,000
Long-term Debt, Fair Value										132,500,000	129,600,000													132,500,000
Secured Debt [Member] | Payment No Later than Third Quarter 2021 [Member] | New Term Loan Agreement [Member]
Debt (Details) [Line Items]
Debt, Pre-payment			$ 5,000,000.0
Reported Value Measurement [Member] | 3.25% Convertible Senior Notes Due 2023 [Member]
Debt (Details) [Line Items]
Value of debt outstanding										20,000,000.0	$ 22,900,000													20,000,000.0
Interest Payable										$ 900,000														$ 900,000

[1] The amount presented excludes accrued, but unpaid, PIK interest of $5.5 million and $4.7 million as of March 31, 2021 and December 31, 2020, respectively.