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6. Stock-Based Compensation (Details) - Employee Stock Plan
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Shares Available for Grant, Beginning 196
Shares Available for Grant, Authorized 655
Shares Available for Grant, Granted (725)
Shares Available for Grant, Forfeited/Expired 0
Shares Available for Grant, Ending 340
Number of Shares Outstanding, Beginning 2,189
Number of Shares Authorized 0
Number of Shares Granted 725
Number of Shares Forfeited/Expired (2)
Number of Shares Outstanding, Ending (340)
Weighted Average Exercise Price Outstanding, Beginning | $ / shares $ 2.70
Weighted Average Exercise Price Authorized | $ / shares .00
Weighted Average Exercise Price Granted | $ / shares .70
Weighted Average Exercise Price Forfeited/Expired | $ / shares .67
Weighted Average Exercise Price Outstanding, Ending | $ / shares $ 4.69