Redeemable Convertible Preferred Stock (Details)		1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 22, 2016 shares	Nov. 30, 2018 USD ($) shares	Dec. 31, 2019 USD ($) installment $ / shares shares	Dec. 31, 2019 USD ($) installment $ / shares shares	Dec. 31, 2017 shares	Dec. 31, 2018 $ / shares shares
Redeemable preferred stock
Number of preferred shares that had been converted to common stock			30,962
Series C Redeemable Convertible Preferred Stock
Redeemable preferred stock
Conversion price per share | $ / shares			$ 0.2343	$ 0.2343		$ 0.2343
Preferred Stock, Shares Outstanding			2,620	2,620		2,620
Dividend rate				8.00%
Original issue price | $				$ 248.794
Series C Redeemable Convertible Preferred Stock | Minimum
Redeemable preferred stock
Conversion price per share | $ / shares			$ 0.1554	$ 0.1554
Series D Redeemable Convertible Preferred Stock
Redeemable preferred stock
Shares issued (in shares)	18,500
Number of preferred shares that had been converted to common stock					14,800
Series E Redeemable Convertible Preferred Stock
Redeemable preferred stock
Shares issued (in shares)		35,000
Net proceeds from public offering | $		$ 30,900,000
Number of monthly installments | installment			13	13
Redemption value for each installment | $			$ 2,700,000	$ 2,700,000
Discount on market price			15.00%	15.00%
Conversion price per share | $ / shares			$ 2.31	$ 2.31
Preferred Stock, Shares Outstanding			500	500		35,000
Number of redeemed shares				4,038
Amount of redeemed shares | $				$ 4,000,000
Number of preferred shares that had been converted to common stock				30,462
Number of shares of common stock issued on conversion of preferred stock				13,800,000
Liquidation preference percentage				125.00%
Redeemable stock issued, initial stated value (in dollars per share) | $ / shares				$ 1,000