Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands				1 Months Ended			3 Months Ended			10 Months Ended	12 Months Ended
	Sep. 16, 2015 USD ($)	Sep. 11, 2015 $ / shares shares	Aug. 06, 2014 USD ($) $ / shares shares	Jul. 31, 2014 shares	Nov. 30, 2013 $ / shares shares	Sep. 30, 2013 shares	Sep. 30, 2014	Mar. 31, 2014 shares	Sep. 30, 2013 $ / shares shares	Oct. 31, 2013 USD ($) $ / shares	Dec. 31, 2015 USD ($) plan $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Jul. 22, 2015 shares	Jul. 21, 2015 shares	May. 06, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, number of shares authorized											30,000,000	15,000,000		30,000,000	15,000,000
Issuance of common stock (in shares)		1,500,000	1,175,000
Share price (in dollars per share) | $ / shares		$ 17.00	$ 4.50								$ 13.75
Proceeds from issuances of common stock, net | $	$ 23,600		$ 5,150								$ 23,574	$ 5,952	$ 0
Additional shares purchased (in shares)			176,250
Number of shares			47,000
Warrant issuance of common stock sold			4.00%
Exercise price (in dollars per share) | $ / shares			$ 5.40
Percentage of public offering price			120.00%
Conversion price (in dollars per share) | $ / shares										$ 2.30
Debt conversion, converted instrument, number of shares issued								3,323,913
Number of additional other equity-based plans | plan											2
Vesting period											10 years
Unamortized stock compensation expense | $											$ 992	$ 387
Remaining weighted average life											1 year 10 months 21 days	2 years 7 months 6 days
Intrinsic value of options exercised | $											$ 485
Intrinsic value of options outstanding | $											4,200
Intrinsic value of options exercisable | $											$ 2,300
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized						500,000			500,000
Number of shares available for grant (in shares)											465,535
Purchase price of common stock, percent						85.00%
Shares issued in the period (in shares)											18,119	9,932	17,655
Employee severance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Acceleration of vesting (in options)					7,000
Grant price (in dollars per share) | $ / shares					$ 2.30
Expiration period					1 year					3 months
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							1 year
Restricted shares granted (in shares)									5,122		0	0	0
Number of restricted shares forfeited (in shares)											0	2,439	1,463
Restricted stock, vested (in shares)				1,220								35,869	5,592
Fair value of restricted shares (in dollars per share) | $ / shares									$ 4.10			$ 0.00	$ 0.00
Minimum | Employee severance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period									1 year
Minimum | Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period											1 year
Maximum | Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period											4 years
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized														600,000		600,000
Number of shares available for grant (in shares)											795,169
Expiration period											10 years
2014 Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period											3 years
2014 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period											4 years
Unsecured convertible notes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unsecured convertible notes | $										$ 7,600
Shares sold by selling stockholders
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock (in shares)		1,500,000