Debt - Narrative (Details)											1 Months Ended				3 Months Ended					6 Months Ended		9 Months Ended	12 Months Ended
	Jan. 27, 2021 USD ($) $ / shares shares	Sep. 22, 2020 USD ($) $ / shares	Jul. 20, 2020 USD ($) loan $ / shares shares	May 28, 2020 USD ($) $ / shares	Apr. 06, 2020 USD ($) $ / shares shares	Oct. 31, 2019 USD ($) $ / shares	Sep. 18, 2019 USD ($)	Dec. 21, 2018 USD ($)	Dec. 13, 2018 USD ($)	Apr. 27, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Nov. 30, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Jun. 30, 2021 USD ($) shares	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) $ / shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Nov. 02, 2020	May 15, 2020
Debt Instrument [Line Items]
Stated interest rate																									1.00%
Remeasured derivative liability															$ 0					$ 0		$ 0	$ 7,507,000
Reverse stock split, conversion ratio				0.10
Derivative liability				$ 6,300,000														$ 5,600,000			$ 5,600,000
Mark-to-market loss recognized																		3,500,000			3,500,000
Aggregate principal amount															111,882,000					111,882,000		$ 111,882,000	181,580,000
Partial extinguishment of equity component																				26,877,000
Gain (loss) on restructuring															0			0		22,439,000	0
Inducement loss															0			0		1,889,000	0
Change in the fair value of derivative liabilities															$ 0			$ (4,591,000)		$ (3,186,000)	$ (5,849,000)
Pre-reverse stock split shares (in shares) | shares					538,995										538,995					538,995		538,995
Exercise price (dollars per share) | $ / shares			$ 0.01		$ 0.01
Estimated fair value of the warrants			$ 300,000	$ 2,200,000	$ 1,400,000
Period warrants are exercisable			5 years		5 years
Exercisable warrants (in shares) (up to) | shares			134,667												134,667					134,667		134,667
Paid-in-kind interest	$ 24,500,000
Line of Credit
Debt Instrument [Line Items]
Interest rate, effective percentage					4.25%
Liquidity covenant compliance					$ 10,000,000.0
Series D Preferred Stock
Debt Instrument [Line Items]
Preferred stock, convertible, shares issuable (in shares) | shares	17,082,285
2023 Series A Unsecured Convertible Notes for Series B Senior Unsecured Convertible Notes
Debt Instrument [Line Items]
Debt issuance costs															$ 1,400,000					$ 1,400,000		$ 1,400,000
Fair value of embedded derivative liability						$ 2,000,000.0
Derivative liability						13,500,000
Remeasured derivative liability																			$ 2,800,000
Gain on change in fair value of derivative																			$ 4,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Change in the fair value of derivative liabilities																							5,600,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt issuance costs									$ 300,000
Unamortized discount									500,000
Aggregate principal amount															25,000,000					$ 25,000,000		25,000,000	25,000
Line of credit maximum borrowing capacity									25,000,000.0
Proceeds from lines of credit							$ 2,500,000		15,000,000.0				$ 5,000,000.0	$ 5,000,000.0
Repayment fee												$ 100,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate																				3.75%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate					1.50%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate					5.50%
Revolving Credit Facility | Base Rate | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate					4.50%															2.75%
Convertible Notes Payable
Debt Instrument [Line Items]
Unamortized discount			$ 14,600,000
Extinguishment gain																	$ 11,800,000
Partial extinguishment of equity component			16,200,000
Lender fees			1,800,000
Third party fees			2,200,000
Gain (loss) on restructuring																	1,200,000
Equity component recorded in APIC																	1,000,000.0
Debt conversion, shares issued (in shares) | shares	85,412
Term Loan
Debt Instrument [Line Items]
Aggregate principal amount															$ 86,600,000					$ 86,600,000		$ 86,600,000
Term Loan | Line of Credit
Debt Instrument [Line Items]
Debt issuance costs									800,000
Unamortized discount									1,800,000
Aggregate principal amount									80,000,000.0
Covenant, revenue required to attain																				$ 125,000,000.0
Term Loan | London Interbank Offered Rate (LIBOR) | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate																				8.75%
Term Loan | London Interbank Offered Rate (LIBOR) | Minimum | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate					1.50%
Term Loan | London Interbank Offered Rate (LIBOR) | Maximum | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate					13.00%
Term Loan | Base Rate | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate					12.00%															7.75%
Convertible Note 2019 | Convertible Notes Payable
Debt Instrument [Line Items]
Stated interest rate										3.75%
Debt, transfer										$ 75,100,000
Convertible Note 2023 | Convertible Notes Payable
Debt Instrument [Line Items]
Stated interest rate										4.75%
Debt, transfer										$ 75,100,000
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares										$ 44.50
Settlement conversion price (dollars per share) | $ / shares										$ 35.60
Debt issuance costs										$ 1,600,000
Unamortized discount										$ 19,000,000.0
Interest rate, effective percentage										11.90%
Senior Notes, due December 2019 | Convertible Notes Payable
Debt Instrument [Line Items]
Gross cash proceeds						$ 29,300,000
Delayed Draw Term Loan A | Term Loan
Debt Instrument [Line Items]
Debt issuance costs									500,000
Proceeds from lines of credit											$ 10,000,000.0
Amount drawn								$ 20,000,000.0
Delayed Draw Term Loan A | Term Loan | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount									30,000,000.0
Delayed Draw Term Loan A | Term Loan | Minimum
Debt Instrument [Line Items]
Interest rate, effective percentage															9.60%					9.60%		9.60%
Delayed Draw Term Loan A | Term Loan | Maximum
Debt Instrument [Line Items]
Interest rate, effective percentage															10.90%					10.90%		10.90%
Delayed Draw Term Loan B | Term Loan | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount									15,000,000.0
Partial extinguishment of Convertible 3.75% Senior Notes											$ 15,000,000.0
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Stated interest rate						7.00%
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares				$ 7.20		$ 7.20					$ 7.20								$ 7.20
Debt issuance costs						$ 2,300,000
Gross cash proceeds						34,400,000
Debt conversion, converted instrument, amount		$ 500,000
Net proceeds from the offering						$ 26,900,000
PIK interest						8.00%
Increase to principal balance																$ 0			$ 0
Aggregate principal amount				$ 34,405,000							$ 34,405,000								$ 34,405,000
Discount on principal amount		31.90%
Extinguishment of liability component			$ 500,000
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable | Series B Convertible Note Holders
Debt Instrument [Line Items]
Stated interest rate			7.00%
PIK interest			8.00%
Discount on principal amount			10.00%
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable | 2023 Note Holders
Debt Instrument [Line Items]
Discount on principal amount			55.00%
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable | 2023 Series A Unsecured Convertible Notes for Series B Senior Unsecured Convertible Notes
Debt Instrument [Line Items]
Debt issuance costs															$ 200,000					$ 200,000		$ 200,000
Debt conversion, converted instrument, amount						$ 5,100,000
Carrying value of original debt															7,200,000					7,200,000		7,200,000
Fair value of embedded derivative liability															2,000,000.0					2,000,000.0		2,000,000.0
Future undiscounted cash flows															$ 6,800,000					$ 6,800,000		$ 6,800,000
Series A Unsecured Convertible Notes due 2023 | Convertible Notes Payable
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount		$ 59,000,000.0
Discount on principal amount		53.40%
Extinguishment of liability component			$ 19,300,000
Series A Unsecured Convertible Notes due 2023 | Convertible Notes Payable | 2023 Series A Unsecured Convertible Notes for Series B Senior Unsecured Convertible Notes
Debt Instrument [Line Items]
Original exchange amount						$ 9,000,000.0
Senior Notes, Due 2023
Debt Instrument [Line Items]
Interest rate at period end															27.40%					27.40%		27.40%
Face amount of the 2023 Loan (due February 2023) | Term Loan
Debt Instrument [Line Items]
Aggregate principal amount															$ 86,605,000					$ 86,605,000		$ 86,605,000	$ 102,905,000
2023 Series D Convertible Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Stated interest rate			9.50%																					18.00%
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares			$ 2.78
Gross cash proceeds			$ 10,000,000.0
Original exchange amount			32,300,000
Debt conversion, converted instrument, amount	$ 50,300,000
Increase to principal balance																				0.0
Aggregate principal amount			$ 13,800,000
Conversion premium percentage			20.00%
Consecutive trading days | loan			10
Default threshold percentage			25.00%
Debt conversion, shares issued (in shares) | shares	29,862,641
Sale of stock, price per share (usd per share) | $ / shares	$ 0.90
2023 Series D Convertible Notes | Convertible Notes Payable | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Conversion price percentage			100.00%
2023 Series D Convertible Notes | Convertible Notes Payable | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Conversion price percentage			75.00%
2023 Series D Convertible Notes | Convertible Notes Payable | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Conversion price percentage			50.00%
2023 Series D Convertible Notes | Convertible Notes Payable | Series B Convertible Note Holders
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount			$ 35,900,000
2023 Series D Convertible Notes | Convertible Notes Payable | 2023 Note Holders
Debt Instrument [Line Items]
Original exchange amount			3,700,000
Debt conversion, converted instrument, amount			$ 8,200,000
2023 Series D Convertible Notes | Convertible Notes Payable | Maximum
Debt Instrument [Line Items]
Stated interest rate			18.00%
2023 Series D Convertible Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares		$ 1.50
Debt issuance costs																	$ 600,000
Original exchange amount																				$ 3,100,000
Debt conversion, converted instrument, amount		$ 27,900,000																				$ 27,600,000
Aggregate principal amount		50,100,000
Default threshold percentage																				25.00%
Extinguishment gain																				$ 5,400,000
Debt conversion, shares issued (in shares) | shares																						18,400,000
Conversion rate																				666.6667%
Inducement loss																				$ 1,900,000
2023 Series D Convertible Notes | Convertible Notes Payable | 2023 Series D Convertible Notes in exchange for 2023 Series A Convertible Notes
Debt Instrument [Line Items]
Original exchange amount		27,500,000
2023 Series D Convertible Notes | Convertible Notes Payable | 2023 Series D Convertible Notes in Exchange for 2023 Series B Convertible Notes
Debt Instrument [Line Items]
Original exchange amount		$ 400,000
Delayed Draw Term Loan C | Term Loan | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount	$ 4,600,000														$ 4,600,000					4,600,000		$ 4,600,000
2023 Term Loan
Debt Instrument [Line Items]
Increase to principal balance																				$ 5,100,000
Paid-in-kind interest option term																				24 months
2023 Term Loan | Minimum
Debt Instrument [Line Items]
Interest rate, effective percentage															16.60%					16.60%		16.60%
2023 Term Loan | Maximum
Debt Instrument [Line Items]
Interest rate, effective percentage															17.70%					17.70%		17.70%
2023 Term Loan | Term Loan | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount									$ 50,000,000.0