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Note 7 - Common Stock Reserved for Future Issuance (Details)
Dec. 31, 2015
shares
Stock options outstanding (in shares) 8,434,988
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,880,849
Employee stock purchase plan (in shares) 99,532
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,565,477
Common stock underlying Convertible Notes outstanding (in shares) 7,086,560
Total shares reserved for future issuance (in shares) 23,067,406