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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets |  |
State tax loss carryforwards | $ 7,493 | $ 6,839
Share issuance costs | 8,011 | 6,662
Lease accruals and reserves | 8,384 | 5,747
Tax loss carryforwards | 12,047 | 4,283
Scientific Research & Experimental Development (SR&ED) expenditure carryforwards | 2,539 | 3,486
Temporary differences on capital and intangible assets | 2,366 | 3,236
Investment tax credits | 3,294 | 3,046
Stock based compensation expense | 6,427 | 237
Valuation allowance | (46,343) | (31,653)
Total deferred tax assets | 4,218 | 1,883
Deferred tax liabilities |  |
Capitalized software development costs | 5,350 | 3,271
Total deferred tax liabilities | 5,350 | 3,271
Net deferred tax liability | $ 1,132 | $ 1,388

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