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Related Party Transaction	9 Months Ended
Related Party Transaction	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transaction	14. Related Party Transaction In 2016, the Company entered into an agreement with a significant stockholder to license certain technology intended to be incorporated into the Company’s products under development. Under this agreement, the Company agreed to pay an initial $2.0 million licensing fee and additional licensing fees at a later point of the development program upon the achievement of certain development milestones. In addition, royalties may be due on products sold utilizing the licensed technology. From time to time, the Company also purchases tooling, mask sets, wafers and services from this stockholder in its ordinary course of business. As of December 31, 2017, the total balance due this stockholder was $3.4 million, which was included in accrued, accounts payable and other long-term liabilities. In May 2018, this stockholder ceased to be a beneficial owner of more than 5% of the outstanding common stock.