Debt (Details)												1 Months Ended												3 Months Ended	6 Months Ended	12 Months Ended
		Mar. 09, 2021 USD ($) shares	Mar. 02, 2021 USD ($) shares	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 ($)	Nov. 07, 2017 USD ($)	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	Jun. 30, 2017 USD ($) shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Feb. 09, 2021 $ / shares	Feb. 05, 2021 USD ($)	Aug. 09, 2020 $ / shares	Jul. 09, 2020 $ / shares	Feb. 09, 2019 $ / shares	Aug. 01, 2018 USD ($)	Jun. 14, 2018 USD ($)	Mar. 31, 2017 USD ($)
Debt (Details) [Line Items]
Value of debt outstanding												$ 34,134,000														$ 34,134,000	$ 52,658,000
Gain (Loss) on Extinguishment of Debt																										$ 0	$ (13,205,000)	$ (453,000)
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares												$ 0.001														$ 0.001	$ 0.001						$ 0.001
Paid-in-Kind Interest																										$ 4,366,000	$ 1,725,000	0
Stock Issued During Period, Value, Conversion of Convertible Securities	[1]																									20,212,000
Adjustments to Additional Paid in Capital, Other	[1]																									1,000
Liabilities, Fair Value Adjustment																										(2,265,000)	(5,112,000)	2,948,000
Debt Issuance Costs, Gross																																				$ 1,300,000
Debt Instrument, Unamortized Discount												$ 0														0	0
Amortization of Debt Discount (Premium)																										$ 2,800,000	1,077,000	0
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												$ 34,100,000														$ 34,100,000	50,800,000
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		177,085	177,085									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		$ 1,000,000.0	$ 1,000,000.0									$ 1,000,000.0	$ 4,000,000.0	$ 2,000,000.0	$ 1,000,000.0	$ 7,100,000
Paid-in-Kind Interest		$ 42,516	$ 42,009									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												$ 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
Amortization of Debt Discount (Premium)																										$ 0	460,000	789,000
3.25% Convertible Senior Notes (due 2020) [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										3.25%		4.875%								3.25%						4.875%
Debt Instrument, Face Amount										$ 8,000,000.0
Debt Instrument, Convertible, Conversion Ratio										322.2688
Debt Instrument, Convertible, Incremental Value of Principal Converted										$ 1,000
Debt Instrument, Redemption Price, Percentage									105.00%
Debt Conversion, Converted Instrument, Amount												$ 1,000,000.0	4,000,000.0	2,000,000.0	1,000,000.0	7,100,000
Paid-in-Kind Interest												36,528	$ 138,248	$ 63,225	$ 27,288	$ 200,000
Long-term Debt, Fair Value																											1,700,000
4.875% Convertible Senior Notes Due 2020 [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						4.875%						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																											1,700,000
Amortization of Debt Discount (Premium)																										0	0	103,000
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												900,000														900,000
Long-term Debt, Excluding Current Maturities												$ 5,300,000														5,300,000
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																										1,300,000
Liabilities, Fair Value Adjustment																										(2,300,000)	2,600,000
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																											(2,500,000)	$ 2,900,000
Common Stock [Member]
Debt (Details) [Line Items]
Stock Issued During Period, Value, Conversion of Convertible Securities	[1]																									2,000
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
Common Stock [Member] | 3.25% Convertible Senior Notes (due 2020) [Member]
Debt (Details) [Line Items]
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares												177,085	708,340	354,170	177,085	710,100
Stock Issued During Period, Value, Conversion of Convertible Securities												$ 1,400,000	$ 5,400,000	$ 2,600,000	$ 1,300,000	$ 9,500,000
Secured Debt [Member] | New Term Loan Agreement [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																	10.50%
Value of debt outstanding	[2]											119,801,000														119,801,000	134,801,000
Interest Payable												4,700,000														4,700,000	1,300,000
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						$ 34,000,000.0
Debt Instrument, Covenant Compliance, Minimum Liquidity						$ 10,000,000.0
Repayments of Debt				$ 15,000,000.0
Notes Payable												124,500,000														124,500,000
Notes Payable, Current												5,000,000.0														5,000,000.0
Notes Payable, Noncurrent												114,800,000														114,800,000
Debt Issuance Costs, Gross								3,800,000
Amortization of Debt Issuance Costs																										1,000,000.0	400,000
Debt Instrument, Unamortized Discount								$ 10,100,000
Amortization of Debt Discount (Premium)																										2,800,000	1,100,000
Long-term Debt, Fair Value												129,600,000														129,600,000	123,400,000
Reported Value Measurement [Member] | 3.25% Convertible Senior Notes Due 2023 [Member]
Debt (Details) [Line Items]
Value of debt outstanding												22,900,000														22,900,000	37,600,000
Interest Payable												$ 900,000														$ 900,000	$ 400,000
Forecast [Member] | Secured Debt [Member] | New Term Loan Agreement [Member]
Debt (Details) [Line Items]
Debt Instrument, Covenant Compliance, EBITDA Requirment					$ 25,000,000.0
Debt, Pre-payment					15,000,000.0
Forecast [Member] | 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

[1] After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.

[2] The amount presented excludes accrued, but unpaid, payment-in-kind interest of $4.7 million and $1.3 million as of December 31, 2020 and 2019, respectively.