Acquisition - Additional Information (Details) - CrossView, Inc. - USD ($)		12 Months Ended
Aug. 05, 2015	Dec. 31, 2018
Business Acquisition [Line Items]
Consideration paid	$ 30,700,000
Number of shares of common stock issued	553,223
2017 Earn-out Payments
Business Acquisition [Line Items]
Consideration paid		$ 4,100,000
2018 Earn-out Payments
Business Acquisition [Line Items]
Earn-out payments, maximum		0
Additional expense related to change in fair value of performance-based contingent payments liability		100,000
Cash in excess of original estimate for performance-based contingent consideration liability		2,400,000
Restricted Stock \| 2017 Earn-out Payments
Business Acquisition [Line Items]
Share consideration		$ 800,000
Issuance of restricted shares		76,998

Business combination contingent earn-out payment in common stock and cash.

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Payment of cash in excess of original estimate for performance-based contingent consideration liability.

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Number of shares of equity interests issued or issuable to acquire entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Number of shares of stock issued during the period pursuant to acquisitions.

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