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5. Stock-Based Compensation (Details) - Employee Stock Plan
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
Shares Available for Grant, Beginning 95
Shares Available for Grant, Authorized 655
Shares Available for Grant, Granted (711)
Shares Available for Grant, Exercised 0
Shares Available for Grant, Forfeited/Expired 69
Shares Available for Grant, Ending 108
Number of Shares Outstanding, Beginning 980
Number of Shares Authorized 0
Number of Shares Granted 711
Number of Shares Exercised 0
Number of Shares Forfeited/Expired (69)
Number of Shares Outstanding, Ending 1,622
Weighted Average Exercise Price Outstanding, Beginning | $ / shares $ 5.76
Weighted Average Exercise Price Authorized | $ / shares 0
Weighted Average Exercise Price Granted | $ / shares 2.52
Weighted Average Exercise Price Exercised | $ / shares 0
Weighted Average Exercise Price Forfeited/Expired | $ / shares 4.70
Weighted Average Exercise Price Outstanding, Ending | $ / shares $ 4.39