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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investor and Holder of August 2016 Series A Warrants
Related Party Transaction [Line Items]
Revenue from related party		$ 797	$ 0	$ 0
B . Riley Principal Investments
Related Party Transaction [Line Items]
Consulting fees	$ 6	$ 50	$ 56	$ 100

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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-Topic 850
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-Publisher FASB
-Name Accounting Standards Codification
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