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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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies Details [Line Items]
Revenue, net	$ 39,322	$ 48,142	$ 66,736	$ 84,690
Assets	195,092		195,092			$ 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	13,400	11,400	23,100	21,600
Assets	138,400	125,900	138,400	125,900
Foreign
Summary of Significant Accounting Policies Details [Line Items]
Revenue, net	4,900	4,900	8,400	9,200
Assets	$ 56,700	$ 60,900	$ 56,700	$ 60,900
Sales Revenue
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	53.00%	49.00%	50.00%	48.00%
Sales Revenue \| Customer One
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	22.00%	35.00%	25.00%	35.00%
Sales Revenue \| Customer Two
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk	31.00%	14.00%	25.00%	13.00%
Accounts Receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk			64.00%	49.00%
Fair Value, Inputs, Level 2 \| Estimate of Fair Value Measurement
Summary of Significant Accounting Policies Details [Line Items]
Debt instrument, fair value disclosure	$ 52,000		$ 52,000
Fair Value, Inputs, Level 2 \| Reported Value Measurement
Summary of Significant Accounting Policies Details [Line Items]
Debt instrument, fair value disclosure	$ 71,100		$ 71,100