CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Amounts Shown and Supplemental Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 57,601	$ 18,994
Restricted cash	855	250
TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH SHOWN IN STATEMENT OF CASH FLOWS	58,456	19,244
SUPPLEMENTARY INFORMATION ON INVESTING AND FINANCING ACTIVITIES NOT INVOLVING CASH FLOWS:
Cashless exercise of restricted stock units		3
Issuance of shares under employee stock purchase plan	163
Additions to operating lease right of use assets and liabilities	287	736
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest received	177	$ 307
Interest paid	973
Fair value of assets acquired	117,270
Less liabilities assumed	5,827
Net acquired (See "Note 3- Business combination")	111,443
Less cash acquired	38,641
Merger net of cash acquired	$ 72,802