Note 2 - Summary of Significant Accounting Policies - Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Net loss attributable to common stockholders	$ (5,518)	$ (6,224)	$ (17,014)	$ (28,766)	$ (35,692)	$ (48,732)
Weighted average common shares used to compute net loss per share, basic and diluted (in shares)	7,900	1,119	6,189	669	1,068	65
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.70)	$ (5.56)	$ (2.75)	$ (43)	$ (33.42)	$ (749.72)

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration