Stockholders' Equity - Stock Options and a Summary of Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Fair value of options issued (in dollars per share)	$ 0.00	$ 1.74
Exercise price (in dollars per share)	$ 0.00	$ 2.46
Expected life of options (in years)		5 years 9 months 18 days
Risk-free interest rate	0.00%	2.30%
Expected volatility	0.00%	84.30%
Dividend yield	0.00%	0.00%
Number of Options
Outstanding at beginning of period (in shares)	292,871
Granted (in shares)	0
Exercised (in shares)	0
Canceled/forfeited (in shares)	(119,896)
Expired (in shares)	0
Outstanding at end of period (in shares)	172,975
Vested and expected to vest at period end (in shares)	172,462
Exercisable at period end (in shares)	166,527
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 3.78
Granted (in dollars per share)	0.00
Exercised (in dollars per share)	0.00
Canceled/forfeited (in dollars per share)	2.23
Expired (in dollars per share)	0.00
Outstanding at end of period (in dollars per share)	4.86
Vested and expected to vest at period end (in dollars per share)	4.86
Exercisable at period end (in dollars per share)	$ 4.92
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	5 years 8 months
Vested and expected to vest at period end	5 years 8 months
Exercisable at period end	5 years 7 months 12 days