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6. Stock-Based Compensation (Details) - Employee Stock Plan
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Shares Available for Grant, Beginning 196
Shares Available for Grant, Authorized 655
Shares Available for Grant, Granted (1,148)
Shares Available for Grant, Forfeited/Expired 414
Shares Available for Grant, Ending 117
Number of Shares Outstanding, Beginning 2,189
Number of Shares Authorized 0
Number of Shares Granted 1,148
Number of Shares Exercised (2)
Number of Shares Forfeited/Expired (414)
Number of Shares Outstanding, Ending 2,921
Weighted Average Exercise Price Outstanding, Beginning | $ / shares $ 2.70
Weighted Average Exercise Price Authorized | $ / shares 0.00
Weighted Average Exercise Price Granted | $ / shares 1.07
Weighted Average Exercise Price Exercised | $ / shares 0.67
Weighted Average Exercise Price Forfeited/Expired | $ / shares 4.38
Weighted Average Exercise Price Outstanding, Ending | $ / shares $ 1.82