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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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