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Exercise price per share or per unit of warrants or rights outstanding.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Debt - Narrative (Details)									1 Months Ended	3 Months Ended	4 Months Ended	5 Months Ended	6 Months Ended	7 Months Ended	12 Months Ended
Debt - Narrative (Details)	Aug. 20, 2020 USD ($)	Jun. 06, 2020 USD ($) monthlyInstallment $ / shares	May 26, 2020 USD ($)	Apr. 22, 2020 USD ($)	Apr. 08, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 18, 2018 USD ($) monthlyInstallment	Mar. 29, 2018 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) monthlyInstallment loan	Dec. 15, 2017 USD ($) note	Dec. 02, 2020 USD ($)	Oct. 16, 2018 USD ($) note	Dec. 31, 2020 USD ($) monthlyInstallment	Dec. 31, 2019 USD ($) monthlyInstallment	Dec. 31, 2018 USD ($)	Nov. 19, 2018 USD ($)	Oct. 31, 2017 USD ($) monthlyInstallment	Aug. 31, 2017 USD ($) monthlyInstallment	Jul. 31, 2017 USD ($)	Aug. 31, 2015 USD ($)
Debt Instrument [Line Items]
Fair value of warrants outstanding											$ 343,400,000				$ 343,400,000	$ 1,122,000
Loss on extinguishment of debt															3,996,000	6,124,000
Unamortized financing costs and discount											$ 0				0
Fair value of warrants															268,266,000	256,000
Prepayment penalty															1,918,000	0
Proceeds from promissory notes															$ 32,101,000	0
Number of additional equipment loan agreements \| loan											3
Bridge Note
Debt Instrument [Line Items]
Principal amount																						$ 1,500,000
Interest rate (as a percent)																						3.00%
2017 Warrants
Debt Instrument [Line Items]
Fair value of warrants outstanding																1,035,000				$ 480,000
Number of shares available for purchase, percentage of principal advances under 2020 Note											10.00%				10.00%
2018 Warrants
Debt Instrument [Line Items]
Fair value of warrants outstanding							$ 46,000									87,000
2020 Warrants
Debt Instrument [Line Items]
Number of shares available for purchase, percentage of principal advances under 2020 Note		10.00%
Stock price of warrants (in dollars per share) \| $ / shares		$ 43.3039
New Notes \| 2020 Warrants
Debt Instrument [Line Items]
Deferred as discount		$ 1,200,000
Equipment and Loan Agreement
Debt Instrument [Line Items]
Interest rate (as a percent)																					10.35%
Number of promissory notes \| note												3		3
Proceeds from promissory notes												$ 3,200,000		$ 2,200,000
Equipment and Loan Agreement \| Minimum
Debt Instrument [Line Items]
Effective interest rate (as a percent)																					10.37%
Equipment and Loan Agreement \| Maximum
Debt Instrument [Line Items]
Effective interest rate (as a percent)																					13.96%
CARES Act, PPP Loan
Debt Instrument [Line Items]
Interest rate (as a percent)				1.00%
Principal repaid	$ 7,820,000
Loan proceeds				$ 7,800,000
Amount repaid	7,840,000
Accrued interest repaid	$ 26,000
Senior Notes \| The Notes
Debt Instrument [Line Items]
Fee amount		255,000
Amortization of premium on marketable securities										$ 55,000						317,000
Loss on extinguishment of debt		866,000
Unamortized financing costs and discount		86,000
Fair value of warrants		525,000
Senior Notes \| 2017 Note
Debt Instrument [Line Items]
Principal amount																				$ 15,000,000.0
Interest rate (as a percent)																				12.50%
Effective interest rate (as a percent)																				15.68%
Fee amount																				$ 382,000
Number of monthly installments \| monthlyInstallment																				28
Principal repaid						$ 3,600,000
Deferred as discount											$ 0				$ 0	56,000
Senior Notes \| 2018 Notes
Debt Instrument [Line Items]
Principal amount							$ 3,000,000.0
Interest rate (as a percent)							12.50%
Effective interest rate (as a percent)							15.58%
Fee amount							$ 108,000
Number of monthly installments \| monthlyInstallment							27
Minimum liquidity amount							$ 2,000,000.0
Principal repaid						2,400,000
Deferred as discount											0				0	81,000
Senior Notes \| New Notes
Debt Instrument [Line Items]
Principal amount		$ 10,000,000.0				$ 20,000,000.0				$ 20,000,000.0
Interest rate (as a percent)		12.50%
Number of monthly installments \| monthlyInstallment		32
Minimum liquidity amount							$ 5,000,000.0
Amortization of premium on marketable securities													$ 329,000
Proceeds from note			$ 3,000,000.0		$ 17,000,000.0
Note term (in months)		48 months
Non-refundable fee, percentage of each advance		1.50%
Loss on extinguishment of debt															3,100,000
Deferred as discount		$ 361,000
Repayment of debt															30,000,000.0
Prepayment penalty															1,900,000
Legal costs															56,000
Write off of loan origination fees															1,200,000
Term Loan \| Equipment and Loan Agreement
Debt Instrument [Line Items]
Commitment amount								$ 5,400,000													$ 4,000,000.0
Increase of commitment amount								$ 1,400,000
Convertible Promissory Note \| Bridge Note
Debt Instrument [Line Items]
Principal repaid									$ 58,000,000.0
Loss on extinguishment of debt									$ 6,000,000.0
Line of Credit \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit amount																		$ 500,000
Line of credit outstanding																500,000
Repayment of line of credit																$ 500,000
Loans Payable \| Vehicle loan
Debt Instrument [Line Items]
Principal amount											$ 21,000				$ 21,000				$ 73,000
Interest rate (as a percent)											6.29%				6.29%				5.99%
Number of monthly installments \| monthlyInstallment											60				60				60
Loans Payable \| Additional Equipment Loan
Debt Instrument [Line Items]
Principal amount																	$ 182,000
Interest rate (as a percent)																5.89%
Number of monthly installments \| monthlyInstallment																60
Loans Payable \| New Equipment Loan
Debt Instrument [Line Items]
Principal amount											$ 246,000				$ 246,000
Number of monthly installments \| monthlyInstallment																60
Loans Payable \| New Additional Equipment Loan One
Debt Instrument [Line Items]
Principal amount																$ 60,000
Interest rate (as a percent)											6.29%				6.29%
Loans Payable \| New Additional Equipment Loan Two
Debt Instrument [Line Items]
Principal amount																170,000
Interest rate (as a percent)											7.64%				7.64%
Loans Payable \| New Additional Equipment Loan Three
Debt Instrument [Line Items]
Principal amount																$ 16,000
Interest rate (as a percent)											8.91%				8.91%