Stockholders' Equity and Convertible Preferred Stock (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Roll Forward]
Outstanding at beginning
Outstanding at ending
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at beginnning | shares	294,072
Issued | shares	235,294
Exercised | shares	(201,961)
Expired | shares	(8,799)
Outstanding at ending | shares	318,606
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Beginnning balance | $ / shares	$ 38.15
Expired | $ / shares	476.66
Ending balance | $ / shares	$ 22.05
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Roll Forward]
Outstanding at beginning
Issued	587,881
Exercised	504,882
Outstanding at ending	$ 82,999
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Remaining Contractual Life [Roll Forward]
Outstanding at beginnning	1 year 11 months 1 day
Issued	3 months 11 days
Outstanding at ending	1 year 5 months 5 days