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Subsequent Event	6 Months Ended
Subsequent Event	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Events On July 26, 2018, the Company and the former stockholders of RER entered into a mutual general release and settlement agreement resolving litigation that had been pending in the Court of Chancery of the State of Delaware (see Note 9, Commitments and Contingencies). On August 6, 2018, the Company completed a private placement of 12,062,000 shares of common stock and warrants to purchase an additional 4,221,700 shares of common stock, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, to certain accredited investors for gross proceeds of $19.7 million in cash. Each warrant has an initial exercise price of $2.52 per share, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, will be exercisable at any time on or after February 6, 2019, and will expire on August 6, 2023. The warrants may be exercisable on a cashless exercise basis if, and only if, the shares of common stock underlying such warrants cannot be immediately resold pursuant to an effective registration statement or Rule 144 of the Securities Act of 1933, as amended, without volume or manner of sale restrictions. In July 2018, the Company granted 466,500 RSUs and 2,368,750 stock options to employees of the Company.