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5. Stock-Based Compensation (Details) - Employee Stock Plan
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Shares Available for Grant, Beginning 98
Shares Available for Grant, Authorized 655
Shares Available for Grant, Granted (637)
Shares Available for Grant, Forfeited/Expired 46
Shares Available for Grant, Ending 162
Number of Shares Outstanding, Beginning 1,632
Number of Shares Authorized 0
Number of Shares Granted 637
Number of Shares Forfeited/Expired (46)
Number of Shares Outstanding, Ending 2,223
Weighted Average Exercise Price Outstanding, Beginning | $ / shares $ 4.37
Weighted Average Exercise Price Authorized | $ / shares 0.00
Weighted Average Exercise Price Granted | $ / shares 1.72
Weighted Average Exercise Price Forfeited/Expired | $ / shares 21.04
Weighted Average Exercise Price Outstanding, Ending | $ / shares $ 3.27