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Summary of Significant Accounting Policies - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Jun. 30, 2019	Feb. 28, 2015
Common stock warrants \| Oxford Finance LLC
Warrants
Common stock that can be purchased with warrants (in shares)			62,505
Exercise price of warrants (in dollars per share)			$ 6.00
Additional Paid-in Capital
Warrants
Cumulative effect adjustment		$ 213
Accumulated Deficit
Warrants
Cumulative effect adjustment		$ (213)
Warrants \| Common stock warrants \| Hercules Capital, Inc.
Warrants
Common stock that can be purchased with warrants (in shares)			180,274	180,274
Exercise price of warrants (in dollars per share)			$ 5.89	$ 5.89
ASU 2017-11 \| Additional Paid-in Capital
Warrants
Cumulative effect adjustment	$ 213
ASU 2017-11 \| Accumulated Deficit
Warrants
Cumulative effect adjustment	$ (213)