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Note 9 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

										Weighted-
										a verage
						Weighted-				Remaining
						a verage				Contractual
		Shares				Exercise				Term
		(in thousands)				Price				(Years)
Balance at December 31, 2018			15,265			$	18.33				6.87
Granted			253			$	25.99
Exercised			(732	)		$	8.93
Expired and forfeited			(505	)		$	21.11
Balance at March 31, 2019			14,281			$	18.85				7.19

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Three Months Ended March 31,
		2019				2018
Research and development		$	5,324			$	3,036
General and administrative			3,680				2,276
Sales and marketing			8,898				2,389
Total stock-based compensation expense		$	17,902			$	7,701

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		March 31,
		20 19				20 18
Risk-free interest rate			2.5	%			2.6	%
Dividend yield			0.0	%			0.0	%
Volatility			68.8	%			71.4	%
Expected life (years)			6				6

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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