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

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The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Summary of Significant Accounting Policies - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019	Dec. 14, 2019	Feb. 28, 2015
Additional Paid-in Capital
Warrants
Cumulative effect adjustment		$ 213
Accumulated Deficit
Warrants
Cumulative effect adjustment		$ (213)
Warrants \| Common stock warrants \| Hercules Capital, Inc.
Warrants
Number of warrants outstanding (in shares)		180,274		180,274
Exercise price of warrants (in dollars per share)		$ 5.89		$ 5.89
ASU 2017-11 \| Common stock warrants \| Oxford Finance LLC
Warrants
Common stock that can be purchased with warrants (in shares)			62,505
Number of warrants outstanding (in shares)		0
Exercise price of warrants (in dollars per share)			$ 6.00
ASU 2017-11 \| Adjustment \| Additional Paid-in Capital
Warrants
Cumulative effect adjustment	$ 213