Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	260,000,000	260,000,000
Common Stock, Shares, Issued	775,403	695,902
Common Stock, Shares, Outstanding	775,403	695,902
Series A Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	3,848,696	3,848,696
Preferred Stock, Shares Issued	391,210	391,210
Preferred Stock, Shares Outstanding	391,210	391,210
Preferred Stock, Liquidation Preference, Value	$ 3,245	$ 3,245
Series B Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	30,032,100	30,032,100
Preferred Stock, Shares Issued	3,088,444	3,088,444
Preferred Stock, Shares Outstanding	3,088,444	3,088,444
Preferred Stock, Liquidation Preference, Value	$ 41,294	$ 41,294
Series C Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	48,184,000	48,184,000
Preferred Stock, Shares Issued	4,499,921	4,499,921
Preferred Stock, Shares Outstanding	4,499,921	4,499,921
Preferred Stock, Liquidation Preference, Value	$ 75,000	$ 75,000
Series D Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	90,000,000	90,000,000
Preferred Stock, Shares Issued	8,593,360	8,200,297
Preferred Stock, Shares Outstanding	8,593,360	8,200,297
Preferred Stock, Liquidation Preference, Value	$ 157,348	$ 136,675