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Convertible Note Payable - Additional Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jan. 24, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Short-term Debt [Line Items] |  |  |
Outstanding principal and interest, convertible debt |  | $ 6,651 | $ 0
Amortization of debt discount |  | $ 0 | $ 1,152
Interstate Battery Systems International, Inc. |  |  |
Short-term Debt [Line Items] |  |  |
Outstanding principal and interest, convertible debt | $ 6,700 |  |
Amortization of debt discount | 2,600 |  |
Deferred financing expenses | $ 20,000 |  |
11% Convertible Notes |  |  |
Short-term Debt [Line Items] |  |  |
Convertible note interest rate |  | 11.00% |
Amortization period |  | 3 years |
Maturity date |  | May 24, 2019 |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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