Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Assets measured at fair value
Cash and cash equivalents	$ 25,545	$ 21,061
Restricted cash	578	590
Total Assets measured at fair value	26,123	21,651
Liabilities measured at fair value
Contingent consideration	11,635	10,637
Warrant liabilities	4,742	4,636
Total liabilities measured at fair value	16,377	15,273
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets measured at fair value
Cash and cash equivalents	25,545	21,061
Restricted cash	578	590
Total Assets measured at fair value	26,123	21,651
Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Contingent consideration	11,635	10,637
Warrant liabilities	4,742	4,636
Total liabilities measured at fair value	$ 16,377	$ 15,273

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value of financial and nonfinancial obligations.

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Amount of cash and cash equivalents 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. 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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