Consolidated Statements of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical)	12 Months Ended
Dec. 31, 2018 $ / shares
Series A Convertible Preferred Stock
Preferred dividends:
Dividends per share (in dollars per share)	$ 0.04

Dividends declared in the period and the contractual amount of dividends (or interest on participating income bonds) that must be paid per security.

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