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10. Stock-Based Compensation (Details) - Stock Option - $ / shares
 6 Months Ended
Jun. 30, 2015
Shares Available for Grant, Beginning 5
Shares Available for Grant, Authorized 200
Shares Available for Grant, Granted (173)
Shares Available for Grant, Exercised 0
Shares Available for Grant, Forfeited/Expired 50
Shares Available for Grant, Ending 82
Number of Shares Outstanding, Beginning 1,015
Number of Shares Authorized 0
Number of Shares Granted 173
Number of Shares Exercised (137)
Number of Shares Forfeited/Expired (50)
Number of Shares Outstanding, Ending 1,001
Weighted Average Exercise Price Outstanding, Beginning $ 5.51
Weighted Average Exercise Price Authorized 0
Weighted Average Exercise Price Granted 4.28
Weighted Average Exercise Price Exercised 3.79
Weighted Average Exercise Price Forfeited/Expired 2.04
Weighted Average Exercise Price Outstanding, Ending $ 5.84