Annual report pursuant to Section 13 and 15(d)

Cover
- Cover
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Stockholders' Equity - Additional Information (Details)

v3.20.1

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	May 18, 2016	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, authorized (in shares)		100,000,000	50,000,000
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001
Maximum discount ratio of all discounts		99.50%
Unrecognized compensation cost related to unvested share-based compensation arrangements		$ 2,400
Interstate Battery System International, Inc. \| Interstate Battery System International, Inc.
Class of Stock [Line Items]
Cost allocated	$ 771
Debt issuance costs	142
Allocated transaction cost	$ 629
Interstate Battery System International, Inc. and Other Investors \| Convertible Note
Class of Stock [Line Items]
Effective interest rate		184.75%

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