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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Feb. 28, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies Details [Line Items]
Revenue, net	$ 27,414	$ 36,548
Assets	191,862			$ 190,892
Convertible Note 2019
Summary of Significant Accounting Policies Details [Line Items]
Restricted cash			$ 2,700
Domestic
Summary of Significant Accounting Policies Details [Line Items]
Revenue, net	9,700	10,200
Assets	135,500	115,900
Foreign
Summary of Significant Accounting Policies Details [Line Items]
Revenue, net	3,400	4,300
Assets	$ 56,400	$ 65,200
Sales Revenue
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	48.00%	59.00%
Sales Revenue \| Customer One
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	30.00%	38.00%
Sales Revenue \| Customer Two
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	18.00%	11.00%
Sales Revenue \| Customer Three
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk		10.00%
Accounts Receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	37.00%	52.00%
Fair Value, Inputs, Level 2 \| Estimate of Fair Value Measurement
Summary of Significant Accounting Policies Details [Line Items]
Debt instrument, fair value disclosure	$ 64,300
Fair Value, Inputs, Level 2 \| Reported Value Measurement
Summary of Significant Accounting Policies Details [Line Items]
Debt instrument, fair value disclosure	$ 69,900