Tesla Motors ( TSLA ) stock was down Tuesday after a Morgan Stanley analyst lowered his estimates for the luxury electric car maker's Q1 and 2015, ahead of expected Tesla spending to ensure a successful debut of the Model X crossover SUV. Analyst Adam Jonas wrote that Tesla's gross profit margin is apt to deteriorate as production of the Model X rises in the second half of the year. He expects a loss of 77 cents a share for Q1, deeper than the consensus expectation of a 48-cent loss, and for the year a loss of $2.30 a share vs. consensus of a 58-cent per-share profit. "We continue to look for more details surrounding Model X execution — in particular, launch timing, speed of ramp and order backlog," he wrote.