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Stock-based Compensation - Stock-based Compensation Plan Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Number of Outstanding Stock Options, beginning balance (in shares)	1,379,727	615,322
Number of Shares Granted (in shares)	497,978	880,116
Number of Shares Exercised (in shares)	0	0
Number of Shares Canceled (in shares)	(58,261)	(115,711)
Number of Outstanding Stock Options, ending balance (in shares)	1,819,444	1,379,727	615,322
Number of Shares Exercisable (in shares)	1,022,515	635,548
Number of Options Vested or Expected to Vest (in shares)	1,779,597	1,342,518
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 8.71	$ 9.55
Granted in Period, per share (in dollars per share)	4.23	8.17
Exercised, per share (in dollars per share)	0.00	0.00
Canceled, per share (in dollars per share)	7.47	9.05
Ending balance (in dollars per share)	7.52	8.71	$ 9.55
Weighted Average Exercise Price of Options Exercisable, per share (in dollars per share)	8.59	9.41
Weighted Average Exercise Price of Options Vested or Expected to Vest, per share (in dollars per share)	$ 7.55	$ 8.73
Weighted- Average Remaining Contractual Life (in years)	6 years 11 months 23 days	7 years 2 months 5 days	9 years 5 months 23 days
Weighted- Average Remaining Contractual Life, Exercisable (in years)	5 years 6 months 4 days	4 years 6 months 22 days
Weighted- Average Remaining Contractual Life, Vested or Expected to Vest (in years)	6 years 11 months 9 days	7 years 1 month 10 days
Aggregate Intrinsic Value	$ 32,000	$ 0	$ 265,000
Aggregate Intrinsic Value of Options Exercisable	15,000	0
Aggregate Intrinsic Value of Options Vested or Expected to Vest	31,000	0
Total fair value of shares vested during the year	1,534,000	595,000	458,000
Stock option compensation not yet recognized	$ 2,739,000
Share based compensation cost recognition period	2 years 8 months 12 days
Intrinsic value of options exercised	$ 0	$ 0	$ 11,000

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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