Stockholders' (Deficit) Equity - Stock Option Information (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, number of options (in shares) | shares	61,013
Options Outstanding, Weighted-Average Remaining Contractual Life	19 months
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 2.19
Options Exercisable, Number of Options (in shares) | shares	61,013
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.19
2008 grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, number of options (in shares) | shares	26,208
Options Outstanding, Weighted-Average Remaining Contractual Life	11 months
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 2.70
Options Exercisable, Number of Options (in shares) | shares	26,208
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.70
2009 grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, number of options (in shares) | shares	23,490
Options Outstanding, Weighted-Average Remaining Contractual Life	23 months
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 1.74
Options Exercisable, Number of Options (in shares) | shares	23,490
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1.74
2010 grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, number of options (in shares) | shares	11,315
Options Outstanding, Weighted-Average Remaining Contractual Life	30 months
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 1.91
Options Exercisable, Number of Options (in shares) | shares	11,315
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1.91