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Stock-Based Compensation - Narrative (Details)	1 Months Ended		3 Months Ended			9 Months Ended
	May 31, 2015 shares	Jun. 30, 2010 USD ($) item	Sep. 30, 2017 USD ($) shares	Mar. 31, 2017 shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Options granted (in shares) | shares			0
Options
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Unamortized compensation cost, net of expected forfeitures | $			$ 1,100,000			$ 1,100,000
Weighted average expected period over which the expense is to be recognized						1 year 10 months 24 days
Tax benefits associated with exercise of stock options | $			0		$ 0	$ 0	$ 0
Stock options exercised | shares						0	0
RSU's
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Weighted average expected period over which the expense is to be recognized						1 year 4 months 24 days
Unamortized compensation cost for awards other than options, net of expected forfeitures | $			600,000			$ 600,000
Cash paid for employee income tax related to settlement of RSUs | $						22,000
Total intrinsic value of the restricted stock units outstanding | $			$ 400,000			$ 400,000
RSU's | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Stock-based compensation expense, recognition period						3 years
RSU's | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Stock-based compensation expense, recognition period						5 years
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Increase in number of shares reserved for issuance | shares	200,000
Number of offering periods | item		2
Offering period		6 months
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less		85.00%
Employee stock purchase plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Maximum amount of shares that eligible employee may purchase annually (in dollars) | $		$ 25,000
Amended and Restated 2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Increase in number of shares reserved for issuance | shares				50,000
Amended and Restated 2010 Equity Incentive Plan [Member] | Options
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Options granted (in shares) | shares				1,000
Shares issued in Replacement Offering | shares				1,000

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