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Nature of Business and Significant Accounting Policies - Schedule of Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		$ 0
Net cash used in operating activities	$ (1,765)	(14,576)
Net increase in cash, cash equivalents and restricted cash	9,817	11,365
Cash, cash equivalents and restricted cash, end of period	$ 31,076	21,259	$ 9,894
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		(61)
Net cash used in operating activities		(14,637)
Net increase in cash, cash equivalents and restricted cash		11,304
Cash, cash equivalents and restricted cash, end of period		21,198
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		61
Net cash used in operating activities		61
Net increase in cash, cash equivalents and restricted cash		61
Cash, cash equivalents and restricted cash, end of period		$ 61

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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