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Debt - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		18 Months Ended
	Jan. 15, 2018	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2020	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt		$ 4,879			$ 4,855
Interest paid		$ 136	$ 153
Secured Debt | Hercules Technology Growth Capital | Loans Payable
Debt Instrument [Line Items]
Debt payments deferred, consecutive period	13 months
Scenario, Forecast | Secured Debt | Hercules Technology Growth Capital | Loans Payable
Debt Instrument [Line Items]
Amortization of principal and interest, consecutive period				18 months

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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