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Business Combination (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 16, 2014
Fair value of the assets acquired and liabilities assumed:
Goodwill		$ 1,057	$ 1,057
Useful life		15 years
Amortization of IPR&D		$ 1,067	800	$ 0
Pro-Forma Financial Information
Revenue			38,190	21,884
Net loss			(29,090)	(28,605)
Allegro
Business Combination
Number of Allegro shares received for each share of common stock issued and outstanding of a wholly-owned subsidiary of the Company	1
Conversion right, number of shares	964,377
Conversion right, cash	$ 2,700
Outstanding indebtedness settled in cash	4,300
Acquisition-related costs	500
Transaction bonuses and severance payments	1,200
Acquisition consideration
Stock	10,078
Cash	2,725
Payment of outstanding indebtedness	4,290
Total acquisition consideration	17,093
Closing price of Company's common stock					$ 10.45
Fair value of the assets acquired and liabilities assumed:
Cash and cash equivalents	29
Other assets, net	7
In-process research and development	16,000
Goodwill	1,057
Total acquisition consideration	$ 17,093
Discount rate (as a percent)	18.50%
Allegro | Transaction bonus and other payments to employees and acquisition related costs
Pro-Forma Financial Information
Net loss			2,200
Allegro | Interest expense related to indebtedness of acquired entity
Pro-Forma Financial Information
Net loss			2,300	$ 4,500
Allegro | IPR&D
Fair value of the assets acquired and liabilities assumed:
Accumulated amortization		1,100	800
Annual amortization expense expected to be recognized		1,900	$ 800
Amortization expense over each of the next five years		$ 1,100
Allegro | IPR&D | Maximum
Fair value of the assets acquired and liabilities assumed:
Useful life		15 years

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