Stockholders' (Deficit) Equity - Authorized Shares (Details) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Stockholders' Equity
Total shares authorized	210,000,000	186,894,620
Common stock, authorized (in shares)	200,000,000	110,000,000
Preferred shares, authorized shares	10,000,000	76,894,620
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001